Stop motion



Jame 16, 1936- G. M. ARRAGG STOP MOTION 2 Sheets-Sheet 1 Filed Aug. 3, 1953 June 16, 1936. M ARRAGG 2,044,238

STOP MOTION Filed Aug. s, 1953 2 Sheets-Sheet '2 Patented June 16, 1936 intent PATENT FFEQE 2,044,238 sror Morrow George M. Arragg, Lawrence, Mass, assignor to Arlington Mills, Lawrence, Mass, a corporation of Massachusetts Application August 3, 1933, Serial No. 683,438

5 Claims.

The present invention relates to stop motions for spinning frames and more particularly to improvements in the lifter unit for stop motions of the general type disclosed in my prior Patent No. 1,735,102, dated November 12, 192.

The principal object of the present invention is to provide an improved form of lifter means with a particular view to a certainty of action, ruggedness and facility of resetting. To this end, the present invention comprises the apparatus hereinafter described and particularly defined in the claims.

In the accompanying drawings, Fig. l is a side elevation partly in section of the preferred form of apparatus according to the present invention;

Fig. 2 is a front elevation of the apparatus with the magnet box removed; Fig. 3 is a view similar to Fig. 1 showing the apparatus with the unit in tripped position; Fig. l is an isometric view of the main frame of the unit; Fig. 5 is a detail view of the delivery roll bracket; Fig. 6 is a de tail view of the lifter; Fig. '7 is a detail view of the magnet armature; Fig. 8 is a section on line 88 of Fig. 3; and Fig. 9 is a detail sectional view on line 99 of Fig. 2.

In the illustrated embodiment of the invention, the roving l0 passes between the positively driven lower back delivery roll 52 and the frictionally driven top back delivery roll I l and thence through the carrier and front delivery rolls to the feeler and bobbin in any suitable manner, similar to that shown in my prior Patent No. 1,735,102. The top delivery roll M is journaled in the side arms is of a yoke-shaped bracket which is shown on a reduced scale in Fig. 5, the ends of the roll shaft being journaled in removable copper bushings it received in the side arms. Each side arm is provided with a boss l9 having a semi-circular recess, for which the bushing forms a lining. Each bushing has a retaining tab it bent over the edge of the boss. The side arms are connected together by a top plate 2i and the bracket is pivoted on a pin 22 in a main frame 24.

The frame 2 3, as shown in Fig. 4, comprises a metal stamping having a back plate 26, a base 28, and sides 35 provided with recesses 32 to engage a rail 34 (see Fig. 3), which extends across the spinning frame, and to which the individual frames 24 are attached. Near the top, the frame 24 is provided with a U-shaped recess 35 to accommodate the roving Ill, as indicated in Figs. 1 and 3.

Extending upwardly through an opening 38 in the top plate 2! of the delivery roll bracket (see Fig. 5) is a rod 40 fixed at its lower end in a ledge i2 extending forwardly from the frame 24. A coiled spring i t encircles the rod and bears against the top plate, the tension of the spring being adjustable by means of a knurled thumb 5 nut it received on the top of the rod. The spring serves to keep the top delivery roll M in frictional engagement with the lower roll l2.

Upon breakage of the roving, the top roll t l is moved out of engagement with the lower roll l2. This is accomplished by means of a lifter indicated generally at 38 and shown in perspective on a reduced scale in Fig. 6. The lifter comprises a top plate 5!! having at the rear a pair of down turned ears 52 which are pivoted on the pin 5% secured in the sides 36 of the frame. At the forward edge, the plate 58 is padded with a piece of leather 5% which is adapted to engage the top delivery roll it when the lifter is released. Below the top plate 5! the lifter is formed with an integral arm 58 which is bent inwardly, as shown in Figs. 2 and 6. At its lower end, the arm 58 extends vertically downward, as ind cated at to, terminating at the bottom in a Vertical latch foot 62. The lifter is normally urged toward its upper position by means of the torsion spring 64 having a portion bearing on the under side of the plate 59 and ends bearing against the back plate 26 of the frame and coils wound on the pin 5d. The spring is sufliciently strong to lift the roll i l against the compression of the spring id. A stop screw (it is threaded in the back plate 26 to engage the rear end of the lifter and prevent an excessive upward swing thereof. A reset handle 68 is secured to the top of the plate 5 The latch foot 62 at the bottom end of the lifter arm is normally held inactive by an armature it! which is shown in detail in Fig. '7. This armature comprises side arms l2 pivoted on a pin 74 and connected at the front end by an armature plate it at the rear end of which rises a latch projection 18 to engage the foot 62. Directly below the armature plate 18 is an electromagnet 8! having a central core 82. Surrounding the exposed upper end of the core 82 is a spring 8 of non-magnetic material, such as phosphor bronze, provided at the top with a loop 86 of smaller diameter than the core, whereby when the armature is attracted, it is prevented from sticking to the core by virtue of the interposed loop. The spring normally holds the armature in upper position in readiness to engage the lower end of the lifter. A stop screw 88 threaded in the frame limits upward movement of the armature.

The magnet core 82 extends through an opening in the base 28 and is riveted thereto as shown in Fig. 1. Washer disks 90 of insulating material are placed at opposite ends of the magnet. The magnet is enclosed by a box 9?. having at the bottom a slot to embrace the core 82 and at the upper end a slot to permit the lower end 60 of the. lifter arm to pass therethrough. The box is clamped in normal position between the side arms 30 of the frame.

The back plate 26 of the frame is provided with an opening covered by a plate 94 of insulating material, carrying two contact springs 96 and 98 secured thereto by means of bolts I and I532 respectively. The upper ends of the contact springs engage contacts I03 which are mounted on the rear end of the lifter arm by a rivet HM, acting as a bridge contact, the rivet and contacts being insulated from the arm by a sleeve H2 and washers I I 4. An insulating sleeve H6 surrounds the pin I4 on which the armature is pivoted to prevent accidental grounding of the contacts. A terminal screw I06 is provided on the insulating plate 94. A wire. )8 runs from the screw I06 to one end of the coil and a wire I It runs from the other end of the coil to the contact screw I00. The external electric circuit which runs from a battery through the feeler is connected to the terminals I06 and I I12. It will be seen that when the circuit is closed at the feeler, current runs from the terminal I86 through the coil to the contact spring 96, through the contact rod I04, the contact 58, and finally to the terminal I02, thereby energizing the magnet and attracting the armature into the position shown in Fig. 3. The lifter is thereby released so that the pad 56 engages the top delivery roll, moving it out of engagement with the lower delivery roll and gripping the roving so that it is immediately broken. At the same time, upon release of the lifter, the circuit to the magnet is broken at the spring contacts 96 and 98, so that the magnet does not remain energized while the bobbin is inoperative. In Fig. 3, the armature is shown in attracted position for the sake of clearness, but it is probable that by the time the lifter is in its clamping position, the armature would have retracted to its uppermost position. The armature is then in readiness to engage the lifter latch when the. latter is manually reset.

The above-described opening in the back plate is filled with a plastic material, preferably molten sulphur, which quickly solidifies into a hard mass, as indicated at I I6 in Fig. 9, thereby holding the contacts, screws and wires against accidental displacement or loosening under the normal vibration of the spinningframe.

Upon discovery of the broken roving, the reset handle 68 is pulled forward, thereby resetting the lifter and permitting the top roll I4 to engage with the bottom roll and thereby to cause resumption of the feed. The roving is then guided through the draft rolls to be pieced with the broken end adjacent to the feeler, as described in my prior patent.

Having thus described the invention, what is claimed is:

l. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket carried by the frame and having side arms, each side arm having a laterally extended boss with an arcuate downwardly extending recess, and an arcuate bushing comprising a piece of malleable. metal lining'the recess and having a retaining tab overlying the boss.

2. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket pivoted in the frame, a delivery roll carried by the bracket, a lifter pivoted in the frame and having a top plate to engage and lift the delivery roll, the lifter having an integral arm depending from one side of the top plate and offset toward the center thereof, a latch piece at the bottom of the arm, and an electromagnet having an armature to engage the. latch piece of the arm.

3. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket carrying a delivery roll, a lifter adapted to engage the delivery roll, latch means for normally holding the lifter out of engagement with the roll including an electromagnet and an armature,

a pair of fixed contacts mounted on and insulated from the frame, a bridge contact carried by the lifter and normally engaging both fixed contacts, and connections between the contacts and the electromagnet.

4. A lifter unit for spinning frame stopmotions comprising a frame, a delivery roll bracket pivoted in the frame and including side arms and a top plate, a delivery roll journaled in the side arms, the top plate having an opening, a rod secured to the frame and extending upwardly through the opening, and a coil spring surrounding the rod and pressing against the top plate to depress the delivery roll.

5. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket 

